Sandpapering-machine.



No. 890,463. PATENTED JUNE 9, I908.-

' E. A. SOULBS,

SANDPAPERING MACHINE.

APPLICATION FILED JUNE 27, 1907.

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No. 890,463. PATENTED JUNE 9, 1908.

. E. A. SOULES.

SANDPAPERING MACHINE.

APPLICATION FILED JUNE 27.1907.

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WITNESSES No. 890,463. PATENTED JUNE '9, 1908.

E. A. SOULES.

- SANDPAPBRING MACHINE.

APPLIQATION TILED JUNE, Z' T. 1907.

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UNITED STATES PATENT OFFICE.

EDGAR A. SOULES, OF STURGIS, MICHIGAN.

SAN DPAPERIN G-MACHIN E To all whom it may concern:

Be it known that I, EDGAR A. SoULEs, a citizen of the United States,residing at Sturgis, in the county of St. Joseph and State of Michigan,have invented a new and useful Sandpapering-Vlachine, of which thefollowing is a specification.

This invention has reference to improvements in sand papering machinesof that class where the sand papering is done by abrasive belts carriedupon suitable pulleys and working continuously on the articles to besand papered. In such machines one or more endless belts having abrasivesurfaces are driven by. suitable power and means are provided wherebythe articles to be sand papered are brought into contact with the movingbelt, which always travels in one direction, in such manner that if anysingle point on the belt be considered it will always travel in the samevertical longitudinal plane, con sidering, of course, that the abrasivesurfaces move in horizontal planes. It is found in such machines thatthere is more or less choking caused by the abraded material clogging upthe spaces between the abrading particles, and thatthe effectiveness ofthe abrad- .ing surfaces rapidly deteriorates.

It is the object of the present invention to provide a means whereby thechoking of the abrading surfaces is prevented, and also a means wherebythe particles of abrading material are caused to act upon the work insuch manner as to repeatedly change the angle of cut and thereby tend toconstantly sharpen the abrading'particles, so that these particlescontinue sharp until practically worn out.

The invention consists in giving a lateral oscillation to the sandpapering belt at either the drive end or the driven end, or both, sothat there is a constant change of cutting surface which not-only tendsto clear the face of the material being cut and so prevent clogging andobstructing the cutting face of the abrasive material, but such motionproduces a shear cut, that is, it is the resultant of the forward andside motions, causing first one side and then the other of each abrasiveparticle to do the cutting, whereby there is a constant sharpening ofthe cutting face. The means employed for producing this oscillatorymovement of the drive or driven shaft or both is applicable to all kindsof abrasive Specification of Letters Patent.

Application filed June27, 1907.

Patented June 9, 1908.

Serial No. 381,109.

cutting belts, whether running horizontal, vertical, or at any angle.Hence, the oscillation of the belt is productive of great saving inabrasive material, thus increasing the life of the belts whether theyare used for cutting wood, leather, or any other substance that can becut and polished with abrasive material.

The invention will be fully understood from the following detaileddescription, taken in connection with the accompanying drawings formingpart of this specification, in which,

Figure l is a plan view of a sandpapering machine of the belt type,showing my 1nven; tion appliedthereto, but all parts of the machineunnecessary to the understanding of the invention are omitted Fig. 2 isa side elevation of the same; and Fig. 3 is a plan View, showing theoscillating mechanism applied to both the drive and driven belts.

Referring to the drawings, there is shown a floor plate 1, onlyconventionally illustrated in the drawing, and near each end of thefloor plate are located posts or standards 2 connected by struts 3 toform the framework of the machine. These parts are simply illustrativeand may be varied at will.

In suitable bearings 4 on one end of the struts 3 is ournaled a shaft5constituting the drive shaft of the machine, and this shaft carriestight and loose pulleys 6 and 7. Fast upon the end of the shaft remotefrom the pulleys 6 and 7 is a band-wheel 8 to be hereinafter referredto. At the other end of the struts 3 are other bearings 9 in which isjournaled a shaft 10 carrying at one end a band wheel 11 in line withthe band-wheel 8, and these two band-wheels receive a belt 12 thesurface of which is provided with or has embedded in it suitableabrasive material of any character desired. This belt is made endlessand is stretched by adjusting screws 13 acting on the bearings 9. Anyother means for rendering the abrasive belt tight maybe used, and, as iscommon in some types of belt sand paper-ing machines, there may beprovided two belts with abrading material of different character or ofdifferent degrees of fineness. These various details, however, form inthemselves no part of the present invention, and are therefore notillustrated in the drawings and need not be further referred to in thedescription.

vided with a vertical stud 21.

The shaft 10 is so mounted in the bearings 9 that it may be reciprocatedlongitudinally for a distance, and this reciprocation may be efiected bymeans which I will now proceed to describe.

The struts 3 carry'other bearing boxes 14 in which is journaled acountershaft 15 carrying between the bearings a pulley 16 receiv ingmotion by a belt 17 passing around said pulley and also around the shaft10 between its bearings 9. By making the belt 16 of a size sufficientlylarge with relation to the diameter of the shaft 10 the s eed of theshaft 15 may be made considerab y less than that of the shaft 10. Theend of the shaft 15 remote from the belt 12 is extended beyond thecorresponding bearing box 14, and there carries a drum 18 having formedin it a cam groove 19, said drum being made fast upon the shaft in anysuitable manner so as to rotate therewith.

Between the boxes 9 and 14 on the strut 3 remote from the belt 12 is abracket 20 pro- Upon this stud is mounted a rock-lever 22 having one end23 forked, as best shown in Fig. 2, and this forked end has inwardlyprojecting fingers 24 engaging in the cam groove 19. The other end ofthe rock-lever is provided with a slot 25 extending therethroughperpendicular to the plane of reciprocation of the lever. Engaging inthe slot 25 is the end of a finger 26 pivotally connected to a sleeve 27mounted upon the shaft 10 between two fixed collars 2829 on said shaft.

It will now be seen that when the drum 18 is rotated the cam groove 19,acting upon the rock-lever 22 through the fingers 24, will cause saidlever to be oscillated about its pivot 21. The finger 26 fits quitesnugly within the groove or slot 25 and therefore participates in thismovement of oscillation, and the finger 26 being connected to the sleeve27 the latter is constrained to oscillate also, and since this sleeve isprevented from movement on the shaft 10, the latter is also caused toreciprocate in its bearings 9, thus causing the band-wheel 11 toalternately approach toward and recede from the nearby strut 3. Now,since the pivot point of the rock lever 22 and the shaft 10 are in fixedrelation, the finger 26 moves along the slot 25 for a limited distancebecause of the areshaped path through which the corresponding end of thelever 22 oscillates, while the pivotal connection between the finger 26and thesleeve 27 permits the said finger to remain in the plane of thelength of the rocklever 22.

Now, let it be suppoesd that the machine is in operation. The abradingbelt 12 is carried continuously over the surface or surfaces to beworked upon, while motion from the shaft 10 is transmitted to the shaft15 through the belt 17 and pulley 16. r The result of this is that theshaft 10 is reciprocated through a distance corresponding to the pitchof the groove 19 and the propor tions of the connections between saidgroove and the sleeve 27, and the end of the abrasive belt 12 carried bythe ban d-wheel 11 is given a movement of reciprocation as it travelsfrom one band-wheel to the other.

. The resultant of the longitudinal and sidewise travel of the belt isthat the, abrasive particles travel at angles to the general plane oftravel of the belt, and, therefore, act upon the work first with oneface and then with another face, thus wearing down the faces alternatelyand producing sharp edges which not only increase the cutting qualitiesof the abrading belts but tend to clear them from accumulations ofabraded material by directing said abraded material first to one sideand then to the other and discharging the same at the edges of the belt.This means that the belt is not only self-cleaning, but, because of thecontinual sharpening of the abrading particles its cutting qualitiesremain sensibly constant until the particles are practically worn out.

In Fig. 3 the reciprocating means are shown in connection with the driveshaft 5 as well as with the driven shaft, and it is to be understoodthat this reciprocating means may be used with either the drive shaft orthe driven shaft, or both, as desired.

The machine shown is of the horizontal type, but it is quite evidentthat the invention is equally applicable to machines of the verticaltype, or to machines in which the abrading belt is set at any angle toeither the vertical or the horizontal.

I claim 1. In a sand papering machine of the abrading belt type whereinthe belt is mounted upon band wheels and the latter are mounted uponshafts, a means for im arting a reciprocating movement to the a rasivebelt, consisting of a counter-shaft, driving connections between thesame and the shaft of an adjacent band wheel, and other connectionsbetween the counter-shaft and said band wheel shaft for impartingreciprocatory movement to the latter in the plane of its axis ofrotation.

2. In a sand papering machine of the abrading belt type wherein the beltis mounted upon band wheels and the latter are mounted upon shafts, ameans for imparting reciprocating movement to the abrasive belt,consisting of a counter-shaft, driving connections between the latterand an adjacent band wheel shaft, and other connections between. thecounter-shaft and. said band wheel shaft for imparting reciprocatorymovement to the latter in the plane of its axis of rotation, saidlast-named connections comprising a cam wheel upon the counter-shaft, asleeve upon the adjacent band wheel shaft, a rocklever engaged by thecam wheel, and pivoted counter-shaft and the adjacent band wheel slipconnections between the sleeve and the rock-lever.

3. In a sand papering machine of the abrading belt type wherein the beltis mounted upon band wheels and the latter are mounted upon shafts, ameans for imparting reciprocating movement to the abrasive belt,consisting of a counter-shaft, a pulley upon the counter-shaft, a beltconnection between the shaft of an adjacent band wheel and said pulley,and other connections between the shaft for imparting a reciprocatorymovement to said band wheel in the plane of its) axis of rotation at aslower speed than the speed of rotation of said band wheel shaft. Intestimony that I claim the foregoing as my own, Ihave hereto affixed mysignature in the presence of two witnesses.

EDGAR A. SOULES. Witnesses J. A. LooMIs, JOHN IV. LUTTNAN.

